The death toll from Severe Acute Respiratory Syndrome in mainland China remained at 332, with more than 5,000 reported cases.

The authorities in Hong Kong said three more people died of Sars on Sunday, bringing the overall death toll to 281.

In Taiwan - where four new cases were reported - the authorities have launched a nationwide "take-your-temperature" campaign, handing out free thermometers.

Toronto health officials said that autopsy tests had shown that some of the four dead patients were carrying the corona virus thought to be the cause of Sars.

The hospital - on the outskirts of the city - has closed its emergency units and walk-in clinics as a precaution.

So far, 30 people in the city are known to have died from Sars.

Extra powers

The BBC's Lee Carter in Toronto says there have been persistent reports of people refusing to remain in quarantine.

Our correspondent says the most blatant example is the case of students from a suburban high school shut down because of one case of probable Sars, who were seen out shopping or even visiting other schools.

On Saturday, Mr Clement said Ontario could employ extra powers if people refuse to remain in quarantine.

"We have the tools in place now, it's a question of whether they're necessary or not and if we think they're necessary we're going to use them," he said.

Our correspondent says that those who attended two funeral services a week ago in Toronto are the latest people to be asked to go into quarantine.